I do not understand the hype about cfr s. they are old technology now. Having tried several tools side by side do not see the attraction. Occasionally will get large volume jobs on upholstery, cinemas, 500+ chairs and the cfr is a clumsy heavy tool to use for long periods. You do get used to using tools and every one has its strengths and weaknesses, some are good for piping etc, the cfr is not anything special, well made and robust but if you do a lot of upholstery you need something light and user friendly.
Peter